Run dartfmt on dart_messages

pkg/dart_messages/test/dart_messages_test.dart

Index: pkg/dart_messages/test/dart_messages_test.dart
diff --git a/pkg/dart_messages/test/dart_messages_test.dart b/pkg/dart_messages/test/dart_messages_test.dart
index 80ecaaf00536526dbdd613d98183839175c5edab..8bc4a868634b604bbedef3be636c075b2c0319a7 100644
--- a/pkg/dart_messages/test/dart_messages_test.dart
+++ b/pkg/dart_messages/test/dart_messages_test.dart
@@ -11,8 +11,9 @@ void testJsonIsUpdated() {
   if (packageRoot == null || packageRoot == "") {
     throw new UnsupportedError("This test requires a package root.");
   }
-  var jsonUri = Uri.parse(packageRoot).resolve(
-      'dart_messages/generated/shared_messages.json');
+  var jsonUri = Uri
+      .parse(packageRoot)
+      .resolve('dart_messages/generated/shared_messages.json');
   var jsonPath = jsonUri.toFilePath();
   var content = new io.File(jsonPath).readAsStringSync();
   if (messagesAsJson != content) {